The Akhal-Teke is a horse breed from Turkmenistan. Only about are left worldwide. Known for their speed and famous for the natural metallic shimmer of their coats. They have been named the most beautiful horse in the world.

Colors of the Akhal Teke by *DancingDragonStables on deviantART

Akhal-Teke -- "a horse breed from Turkmenistan, where they are a national emblem. They have a reputation for speed and endurance, intelligence, and a distinctive metallic sheen." This dark color doesn't show the sheen as much.